+1 on RC3. Been running this in pre-production without issue for a while.

> -----Original Message-----> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Stack> Sent: Friday, January 07, 2011 5:03 PM> To: HBase Dev List> Subject: ANN: The fourth hbase 0.90.0 release candidate is available for> download X> > The fourth hbase 0.90.0 release candidate is available for download:> > http://people.apache.org/~stack/hbase-0.90.0-candidate-3/> > This is going to be the one!> > Should we release this candidate as hbase 0.90.0? Take it for a spin.> Check out the doc., etc. Vote +1/-1 by next Friday, the 14th of January.> > HBase 0.90.0 is the major HBase release that follows 0.20.0 and the fruit of> the 0.89.x development release series we've been running of late.> > Over 1k issues have been closed since 0.20.0. Release notes are available> here: http://su.pr/8LbgvK.> > HBase 0.90.0 runs on Hadoop 0.20.x. It does not currently run on> Hadoop 0.21.0 nor on Hadoop TRUNK. HBase will lose data unless it is> running on an Hadoop HDFS 0.20.x that has a durable sync. Currently only the> branch-0.20-append branch [1] has this attribute (See CHANGES.txt [3] in> branch-0.20-append to see the list of patches involved adding an append).> No official releases have been made from this branch as yet so you will have> to build your own Hadoop from the tip of this branch, OR install Cloudera's> CDH3 [2] (Its currently in beta). CDH3b2 or CDHb3 have the 0.20-append> patches needed to add a durable sync. If using CDH, be sure to replace the> hadoop jars that are bundled with HBase with those from your CDH> distribution.> > There is no migration necessary. Your data written with HBase 0.20.x (or with> HBase 0.89.x) is readable by HBase 0.90.0. A shutdown and restart after> putting in place the new HBase should be all thats involved. That said, once> done, there is no going back to 0.20.x once> the transition has been made. HBase 0.90.0 and HBase 0.89.x write> region names differently in the filesystem. Rolling restart from 0.20.x or> 0.89.x to 0.90.0RC1 will not work.> > Yours,> The HBasistas> P.S. For why the version 0.90 and whats new in HBase 0.90, see slides> 4-10 in this deck [4]> > 1. http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20-> append> 2. http://archive.cloudera.com/docs/> 3. http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20-> append/CHANGES.txt> 4. http://hbaseblog.com/2010/07/04/hug11-hbase-0-90-preview-wrap-up/

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